Theory of Operation

WARNING: This page is about a different car, the 2011 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

The Crankshaft Position (CKP) and Camshaft Position (CMP) Sensors are hall effect type sensors. The Powertrain Control Module (PCM) provides a 5-Volt supply to the position sensor and return circuit. A notch on the crankshaft gear is used to determine the position of the engine by the PCM. As the notch on the crankshaft speed ring or the windows in the back of the camshaft gear move past the position sensor, a signal is generated on the position sensor circuit. The change in engine speed when different calibrated fuel quantities are added by the injector to this cylinder is a measure of how well the cylinder is firing. This DTC is a two trip fault. Active regeneration will be disabled when the mill lamp is on. The PCM will turn off the MIL lamp after the monitor runs and passes three consecutive times.